Is a guardian considered a murderer if he confines his son due to his deviant behavior, and then the son escapes through a window, falls, and dies?

The guardian of the deceased is not considered his killer, because the son killed himself and did not die due to imprisonment. This is unless the guardian knew of the son's intention to commit suicide and informed him of it, in which case he would then be a cause in his killing. This would be considered an error, not an intentional act.